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I would like to access the Star Wars Ascii movie from the telnet "towel.blinkenlights.nl" within a Docker Container.

Given this Dockerfile based on nerdalert:

FROM alpine:latest

RUN apk add busybox-extras

ENTRYPOINT ["/usr/bin/telnet", "towel.blinkenlights.nl"]

With this Docker Build & Run Commands:

docker build . -t starwars
docker run --rm -i -P starwars

I receive the following error messages:

telnet: can't connect to remote host (213.136.8.188): Connection refused

I also tried this Run Command with the same Error:

docker run --rm --network host -P starwars

and change the Dockerfile Baseimage to bitnami/minideb:stretch with no success.

How should I change the Dockerfile or the Docker run Command to access a (this) remote telnet server?

Without the Docker Container on my Windows Host system - I can access the telnet server towel.blinkenlights.nl easily Working Putty Connection

T1Berger
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  • can you connect to the towel.blinkenlights.nl using telnet from your computer? Looks like it may not be a problem related to docker but may be due to towel.blinkenlights.nl being offline – Matteo Zanoni May 11 '21 at 13:33
  • @MatteoZanoni Sadly, I can connect perfectly to `towel.blinkenlights.nl` with the putty telnet client. So unfortunately there isn't the problem. – T1Berger May 11 '21 at 13:38
  • can you share the putty configurations you use? I tried connecting from my pc with no success... maybe some telnet configuration differ between linux (alpine) and putty. – Matteo Zanoni May 11 '21 at 13:43
  • @MatteoZanoni here is the working putty connection https://i.stack.imgur.com/Y1yu2.png (also added it within the question) Which command did you try on your pc? – T1Berger May 11 '21 at 13:49
  • I just tried `telnet towel.blinkenlights.nl` and it is not working, I have tried also from online tools (like https://adminkit.net/telnet.aspx or https://telnet-online.net ) and neither can connect. Can you retry now and verify it is working on your pc? – Matteo Zanoni May 11 '21 at 13:54
  • Very strange on my windows host system the given telenet-address works perfectly :( Do you know any other working telnet server where I can connect to try out the Dockerfile? – T1Berger May 11 '21 at 14:03
  • Windows has a build it telnet server that you can activate, otherwise most SMTP servers allow you to connect to them through telnet (e.g.: `telnet smtp-relay.gmail.com 25`) – Matteo Zanoni May 11 '21 at 14:12

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